Basic Examples 
(2)
 

List the names of all available symbols that have the
HoldFirst
attribute:
In[4]:=
[◼]
SymbolsWithAttribute
[HoldFirst]
Out[4]=
{AddTo,AppendTo,AssociateTo,BlockRandom,Catch,ClearAttributes,Context,Control,CreateScheduledTask,Debug,Decrement,DialogReturn,DisplayWithRef,DivideBy,DumpSaveToButton,DumpSaveToInterpretation,Dynamic,FunctionsWithAttribute,FunctionsWithOption,HeldDefinition,HeldFullDefinition,Inactivate,Inactive,Increment,InitializationObjects,InitializationValue,Initialize,KeyDropFrom,LocalSubmit,Message,MessageName,MessagePacket,NCache,NotebookSet,OptionsWithValue,Pattern,PreDecrement,PreIncrement,PrependTo,Reap,ReapResultsOnly,RefBox,Refresh,RepeatedTiming,RuleCondition,RunScheduledTask,SessionSubmit,Set,SetAttributes,Stack,SubtractFrom,TimesBy,toHeldDefinition,Unlock,Unset,UpSet,WaitUntil}
List just those symbol names that match the given string pattern:
In[5]:=
[◼]
SymbolsWithAttribute
[HoldFirst,"*To"]
Out[5]=
{AddTo,AppendTo,AssociateTo,PrependTo}

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